Q: What are the key features of this Rolex Datejust 36 ref. 16200 from 1990?
A: It has a 36mm stainless-steel Oyster case with a smooth bezel, sapphire crystal with Cyclops over the date at 3 o’clock, a grey tapestry dial, and an automatic Rolex calibre 3135 with quickset date and approximately 48 hours of power reserve. The crown screws down and, when properly sealed, the model was originally rated to 100 metres of water resistance.

Q: What does the E-serial number (E393738) indicate?
A: Rolex E‑prefix serial numbers correspond to watches produced in 1990. This aligns with the year stated for this piece.

Q: Is the lume tritium on a 1990 Datejust, and will it still glow?
A: Yes—most 1990 Datejust dials and hands used tritium, typically marked T Swiss T<25 or T Swiss Made T at 6 o’clock. Tritium naturally ages to a creamy patina and usually no longer glows strongly. Rolex transitioned to Luminova in the late 1990s.

Q: Can I swim or shower with this vintage Datejust?
A: The Datejust was originally rated to 100m, but water resistance depends on the condition of gaskets and crown seals. For a 1990 watch, we recommend a recent pressure test and ensuring the crown is fully screwed down before any water exposure. Avoid saunas/hot tubs and rinse with fresh water after salt or chlorinated water.

Q: How does the 36mm case wear—will it suit my wrist?
A: The 36mm Datejust is a classic, versatile size that wears compact and elegant on the Jubilee bracelet. This bracelet is currently sized to fit up to a 17.5cm wrist and can be adjusted by adding/removing links. The model suits many wrist sizes and is widely worn by all genders.

Q: How do I set the time and date safely on this watch?
A: Unscrew the crown; position 1 winds the movement, position 2 quicksets the date, and position 3 sets the time. Avoid using the date quickset between roughly 8pm and 4am, when the date-change mechanism is engaged. Always finish by screwing the crown down to maintain water resistance.

Q: How does ref. 16200 differ from earlier Datejust references?
A: Compared with the preceding 160xx generation, the 16200 introduced a scratch‑resistant sapphire crystal and the updated calibre 3135 movement while retaining the classic 36mm case. The 16200 specifically features a smooth stainless‑steel bezel (fluted bezels belong to other references).

Q: What accuracy should I expect from the calibre 3135?
A: When properly serviced and regulated, the 3135 is a COSC‑certified chronometer designed to meet −4/+6 seconds per day in testing. Actual performance varies with age and service history. A periodic service helps maintain accuracy and water resistance.

Q: What servicing cadence is sensible for a 1990 Datejust?
A: Rolex suggests around 10 years for modern watches under normal use; for older pieces, many specialists recommend checks or servicing closer to 5–7 years, especially if worn regularly or exposed to water. A pressure test is advised before swimming.

Q: What accessories are included and can I change straps?
A: This listing includes the watch only (no box or papers). The 36mm Datejust uses a 20mm lug width, so the Jubilee bracelet can be sized with additional links if needed, or the watch can be fitted with compatible 20mm leather or other straps by a professional.

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